Keysight Technologies Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers.

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1 Keysight Technologies Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers Application Note

2 02 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers Application Note Introduction Permittivity Evaluation Definition of permittivity Parallel plate measurement method Permittivity measurement system Measurement system using the 16451B dielectric test fixture Measurement system using the 16453A dielectric test fixture Permeability Evaluation Definition of permeability Inductance measurement method Permeability measurement system Measurement system using the 16454A magnetic material test fixture Conclusion.20 Appendix..21 A. Permittivity Evaluation of Liquids...21 A.1. Measurement system using the 16452A liquid test fixture..21 A.1.1. Main advantages...21 A.1.2. Applicable MUT..21 A.1.3. Structure.21 A.1.4. Principal specifications. 22 A.1.5. Operation method 23 A.1.6. Special considerations..23 References..24

3 1. Introduction Recently, electronic equipment technology has dramatically evolved to the point where an electronic component s material characteristics becomes a key factor in a circuit s behavior. For example, in the manufacture of high capacitance multi-layer ceramic capacitors (ML- CCs), which are being used more in digital (media) appliances, employing high κ (dielectric constant) material is required. In addition, various electrical performance evaluations, such as frequency and temperature response, must be performed before the materials are selected. A material evaluation measurement system is comprised of three main pieces. These elements include: precise measurement instruments, test fixtures that hold the material under test, and software that can calculate and display basic material parameters, such as permittivity and permeability. Various measurement methods for permittivity and permeability currently exist (see Table 1). However, this note s primary focus will be on methods that employ impedance measurement technology, which have the following advantages: Wide frequency range from 20 Hz to 1 GHz High measurement accuracy Simple preparations (fabrication of material, measurement setup) for measurement This note begins by describing measurement methods, systems, and solutions for permittivity in Section 2, followed by permeability in Section 3. The resistivity measurement system and the permittivity measurement system for liquids are described later in the appendix. In fields outside of electronic equipment, evaluating the electrical characteristics of materials has become increasingly popular. This is because composition and chemical variations of materials such as solids and liquids can adopt electrical characteristic responses as substituting performance parameters. Table 1. Measurement technology and methods for permittivity and permeability parameters Measurement parameter Measurement technology Measurement method Impedance analysis Parallel plate Permittivity S parameters Cavity Free space Impedance analysis Inductance Permeability Network analysis Reflection wave S parameters Cavity

4 04 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 2. Permittivity Evaluation 2.1. Definition of permittivity Permittivity describes the interaction of a material with an electric field. The principal equations are shown in Figure 1. Dielectric constant (κ) is equivalent to the complex relative permittivity (εr*) or the complex permittivity (ε*) relative to the permittivity of free space (ε0). The real part of complex relative permittivity (εr ) is a measure of how much energy from an external field is stored in a material; εr > 1 for most solids and liquids. The imaginary part of complex relative permittivity (εr ) is called the loss factor and is a measure of how dissipative or lossy a material is to an external field. εr is always > 0 and is usually much smaller than εr. The loss factor includes the effects of both dielectric loss and conductivity. When complex permittivity is drawn as a simple vector diagram as shown in Figure 1, the real and imaginary components are 90 out of phase. The vector sum forms an angle δ with the real axis (εr ). The tangent of this angle, tan δ or loss tangent, is usually used to express the relative lossiness of a κ* = ε* r = ε * ε" r δ ε 0 ε' = ε' r - j ε" r = - j ε* r ε' r (Real part) κ* = ε* r = ε 0 = (Imaginary part) tan δ = material. The term dielectric constant is often called permittivity in technical literature. In this application note, the term permittivity will be used to refer to dielectric constant and complex relative permittivity. ε r " ε r ' ε 0 (Imaginary) (Real) tan δ = D (Dissibation factor) Dielectic constant Complex relative permitivity Permitivity of free space 1 36π ε" ε 0 X 10-9 [F/m] Figure 1. Definition of relative complex permittivity (εr*)

5 05 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 2.2. Parallel plate measurement method of measuring permittivity When using an impedance-measuring instrument to measure permittivity, the parallel plate method is usually employed. An overview of the parallel plate method is shown in Figure 2. The parallel plate method, also called the three terminal method in ASTM D150, involves sandwiching a thin sheet of material or liquid between two electrodes to form a capacitor. (Note: Throughout the remainder of this document materials under test, whether the material is a solid or a liquid, will be referred to as MUT.) The measured capacitance is then used to calculate permittivity. In an actual test setup, two electrodes are configured with a test fixture sandwiching dielectric material. The impedance-measuring instrument would measure vector components of capacitance (C) and dissipation (D) and a software program would calculate permittivity and loss tangent. The flow of the electrical field in an actual measurement is shown in Figure 3. When simply measuring the dielectric material between two electrodes, stray capacitance or edge capacitance is formed on the edges of the electrodes and consequently the measured capacitance is larger than the capacitance of the dielectric material. The edge capacitance causes a measurement error, since the current flows through the dielectric material and edge capacitor. Solid thickness = t Figure 2. Parallel plate method Electrodes (Area = A) Figure 3. Effect of guard electrode - + Electrical field Cp Liquid Equivalent circuit Edge capacitance (stray) - + G Y = G + jωcp Cp G Co ωco Co : Air capacitance = jωco ( j ) ε r * ε r ' ε r " Electrical field Cp G = ( j Co ωco) t * Cp = ( A * ε o ) = ( ) t ω * Rp * A * ε o Guard electrodes A solution to the measurement error caused by edge capacitance is to use the guard electrode. The guard electrode absorbs the electric field at the edge and the capacitance that is measured between the electrodes is only composed of the current that flows through the dielectric material. Therefore, accurate measurements are possible. When the main electrode is used with a guard electrode, the main electrode is called the guarded electrode.

6 06 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Contacting electrode method: Guarded electrode Guard electrode This method derives permittivity by measuring the capacitance of the electrodes contacting the MUT directly (see Figure 4). Permittivity and loss tangent are calculated using the equations below: tm d g MUT C p : Equivalent parallel capacitance of MUT [F] D: Dissipation factor (measured value) t m : Average thickness of MUT [m] A: Guarded electrode s surface area[m 2 ] d: Guarded electrode s diameter[m] ε 0 : Permittivity of free space = x [F/m] Equations: t m x Cp t m x Cp ε r = = A x ε0 π d 2 xε 2 0 tan δ = D The contacting electrode method requires no material preparation and the operation involved when measuring is simple. Therefore, it is the most widely used method. However, a significant measurement error can occur if airgap and its effects are not considered when using this method. When contacting the MUT directly with the electrodes, an airgap is formed between the MUT and the electrodes. No matter how flat and parallel both sides of the MUT are fabricated, an airgap will still form. Figure 4. Contacting electrode method This airgap is the cause for measurement error because the measured capacitance will be the series connection of the capacitance of the dielectric material and the airgap. The relationship between the airgap s thickness and measurement error is determined by the equation shown in Figure 5. tm Measured capacitance Measured error due to airgap Figure 5. Airgap effects t a C err = 1 + C o ε err ε x 1- = Unguarded electrode A C o = ε o Capacitance of airgap t a A C x = ε x ε o Capacitance of dielectric material t m 1 1 C x ε x - 1 t ε m x + t a Measurement error is a function of the relative permittivity (εr ) of the MUT, thickness of the MUT (tm), and the airgap s thickness (ta). Sample results of measurement error have been calculated in Table 2. Notice that the effect is greater with thin materials and high κ materials. = ε err ε o A t m + t a Table 2. Measurement error caused by airgap ε r t a /t m % 0.4% 1% 2% 5% 9% % 2% 4% 9% 20% 33% % 4% 8% 16% 33% 50% % 16% 30% 48% 70% 83% 0.1 8% 27% 45% 63% 82% 90% This airgap effect can be eliminated, by applying thin film electrodes to the surfaces of the dielectric material. An extra step is required for material preparation (fabricating a thin film electrode), but the most accurate measurements can be performed.

7 07 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Non-contacting electrode method This method was conceptualized to incorporate the advantages and exclude the disadvantages of the contacting electrode method. It does not require thin film electrodes, but still solves the airgap effect. Permittivity is derived by using the results of two capacitance measurements obtained with the MUT and without it (Figure 6). Theoretically, the electrode gap (tg) should be a little bit larger than the thickness of the MUT (tm). In other words, the airgap (tg tm) should be extremely small when compared to the thickness of the MUT (tm). These requirements are necessary for the measurement to be performed appropriately. Two capacitance measurements are necessary, and the results are used to calculate permittivity. The equation is shown at right. Cs1: Capacitance without MUT inserted[f] Cs2: Capacitance with MUT inserted[f] D1: Dissipation factor without MUT inserted D2: Dissipation factor with MUT inserted t g : Gap between guarded/guard electrode and unguarded electrode [m] t m : Average thickness of MUT [m] Equations: ' ε 1 r = C s1 t g 1 1 x C s2 t m ' t tan δ = D g 2 + ε r x (D 2 D 1 ) x 1 t (when tan δ <<1) m Guarded electrode Guard electrode d g MUT tg tm Unguarded electrode Figure 6. Non-contacting electrode method Table 3. Comparison of parallel plate measurement methods Method Contacting electrode (without thin film electrode) Non-contacting electrode Accuracy LOW MEDIUM HIGH Application MUT Solid material with a flat and smooth surface Solid material with a flat and smooth surface Contacting electrode (with thin film electrode) Thin film electrode must be applied onto surfaces Operation 1 measurement 2 measurements 1 measurement

8 08 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 2.3. Permittivity measurement system Two measurement systems that employ the parallel plate method will be discussed here. The first is the 16451B dielectric test fixture, which has capabilities to measure solid materials up to 30 MHz. The latter is the 16453A dielectric material test fixture, which has capabilities to measure solid materials up to 1 GHz. Details of measurement systems described in this note will follow the subheadings outlined below: 1) Main advantages 2) Applicable MUT 3) Structure 4) Principal specifications 5) Operation method 6) Special considerations 7) Sample measurements 2.4. Measurement system using the 16451B dielectric test fixture Applicable measurement instruments: E4990A, 4285A, E4980A, and E4981A Main advantages Precise measurements are possible in the frequency range up to 30 MHz Four electrodes (A to D) are provided to accommodate the contacting and non-contacting electrode methods and various MUT sizes Guard electrode to eliminate the effect of edge capacitance Attachment simplifies open and short compensation Can be used with any impedance-measuring instrument with a 4-terminal pair configuration

9 09 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Applicable MUT The applicable dielectric material is a solid sheet that is smooth and has equal thickness from one end to the other. The applicable dielectric material s size is determined by the measurement method and type of electrode to be used. Electrodes A and B are used for the contacting electrode method without the fabrication of thin film electrodes. Electrodes C and D are used for the contacting electrode method with the fabrication of thin film electrodes. When employing the non-contacting electrode method, electrodes A and B are used. In this method, it is recommended to process the dielectric material to a thickness of a few millimeters. The difference between electrodes A and B is the diameter (the same difference applies to electrodes C and D). Electrodes A and C are adapted for large MUT sizes, and electrodes B and D are adapted for smaller MUT sizes. The applicable MUT sizes for each electrode are shown in Tables 4 and 5. The dimensions of each electrode are shown in Figures 7 through 10. Table 4. Applicable MUT sizes for electrodes A and B Electrode type Material diameter Material thickness Electrode diameter A 40 mm to 56 mm t 10 mm 38 mm B 10 mm to 56 mm t 10 mm 5 mm to 56 Figure 7. Electrode A dimensions Electrode-A Test material 10 Note: signifies diameter. Dimensions are in millimeters. Table 5. Applicable MUT sizes for electrodes C and D Figure 8. Electrode B dimensions Electrode type Material diameter Material thickness Electrode diameter* C 56 mm t 10 mm 5 to 50 mm D 20 mm to 56 mm t 10 mm 5 to 14 mm Electrode-B Test material to 56 Note: signifies diameter. Dimensions are in millimeters Electrode-C Guard thin film electrode Guarded thin film electrode Test material Electrode-D Test material 5 to Note: signifies diameter. Dimensions are in millimeters. Figure 9. Electrode C dimensions The gap width shall be as small as practical 5 to to 50 Note: signifies diameter. Dimensions are in millimeters. Figure 10. Electrode D dimensions The gap width shall be as small as practical

10 10 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Structure In order to eliminate the measurement error caused by edge capacitance, a three-terminal configuration (including a guard terminal) is employed. The structure of the 16451B is shown in Figure 11. Guard terminal Guarded electrode Unguarded electrode The electrodes in the 16451B are made up of the following: 1. Unguarded electrode, which is connected to the measurement instrument s high terminal. 2. Guarded electrode, which is connected to the measurement instrument s low terminal. 3. Guard electrode, which is connected to the measurement instrument s guard terminal (the outer conductor of the BNC connectors). The guard electrode encompasses the guarded (or main) electrode and absorbs the electric field at the edge of the electrodes, making accurate permittivity measurements possible Principal specifications Table 6. Principal specifications of the 16451B Frequency 30 MHz Max voltage ±42 V Operation temperature 0 C to 55 C Terminal configuration 4-terminal pair, BNC Cable length 1 m Compensation Open/short* The principal specifications are shown in Table 6. Figures 12 and 13 show the measurement accuracy when Keysight s E4990A is used. Further details about the measurement accuracy can be obtained from the Accessories Selection Guide for Impedance Measurements (literature number E) Figure 11. Structure of the 16451B Δ ε r' / ε r' [%] Hcur Hpot Lput Lcur 4-terminal pair Electrode A: t = 1 [mm] k 10 k 100 k 1 M 10 M 30 M Frequency [Hz] Figure 12. Permittivity measurement accuracy (supplemental data) tan δ error (Ea) Electrode A: k 10 k 100 k 1 M 10 M 30 M Frequency [Hz] Figure 13. Loss tangent measurement accuracy (supplemental data) t = 1 [mm] er = 50 er = 20 er = 10 er = 5 er = 2 er = 50 er = 20 er = 10 er = 5 er = 2 *When using the 4285A or E4990A above 5 MHz, it is necessary to perform load compensation in addition to open and short compensation. For more details, please refer to Section Operation method.

11 11 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Operation method Figure 14 displays the flowchart when using the 16451B for permittivity measurements. Each step in the flowchart is described here: Step 1. Prepare the dielectric material: Fabricate the MUT to the appropriate size. Use Figures 7 through 10 as references. If the contacting electrode method with thin film electrodes is employed, apply thin film electrodes to the surfaces of the MUT. Step 2. Attach the guarded electrode: Select the appropriate electrode and fit it into the 16451B. Step 3. Connect the 16451B: Connect the 16451B to the unknown terminals of the measurement instrument. Step 4. Cable length compensation: Set the measurement instrument s cable length compensation function to 1 m. Refer to the measurement instrument s operation manual for the setting procedure. Step 5. Compensate the residual impedance of the 16451B: Use the furnished attachment to perform open and short compensation at a specified frequency. This is necessary before adjusting the guarded and unguarded electrodes to be parallel to each other. Step 6. Adjust the electrodes: To enhance the measurement performance, a mechanism is provided to adjust the guarded and unguarded electrodes to be parallel to each other. By performing this adjustment, the occurrence of the airgap when using the contacting electrode method is minimized and an airgap with uniform thickness is created when using the non-contacting electrode method. The adjustment procedure is discussed in the operation manual of the 16451B. Step 7. Set the measurement conditions: Measurement conditions such as frequency and test voltage level are set on the measurement instrument. Refer to the measurement instrument s operation manual for the setting procedure. Step 8. Compensate the residual impedance of the 16451B: Use the furnished attachment to perform open and short compensation of the measurement conditions set in Step 7. When using the Keysight 4285A or E4990A above 5 MHz, it is necessary to perform load compensation also. This is because for high frequency measurements, it is difficult to disregard the residual impedance, which cannot be removed by open and short compensation. In order to compensate the frequency response of the 16451B, a measured value at 100 khz is used as a standard value and load compensation is performed at high frequencies. The air capacitance formed by creating an airgap between the electrodes (with nothing inserted) is adopted as the load device for the 16451B. Table 7 lists the recommended capacitance values that are obtained by adjusting the height of the airgap between the electrodes. It is assumed that the air capacitance has no frequency dependency, no loss and has a flat response. The capacitance value (Cp) at 100 khz (G is assumed to be zero) is used for load compensation. Step 9. Insert MUT: Insert the MUT between the electrodes. Step 10. Cp-D measurement: The capacitance (Cp) and dissipation factor (D) is measured. When employing the non-contacting electrode method, two Cp-D measurements are performed, with and without the MUT. Step 11. Calculate permittivity: As previously discussed in Section 2.2, use the appropriate equation to calculate permittivity. Figure 14. Measurement procedure flowchart for the 16451B Table 7. Load values START 1. Prepare the dielectric material 2. Attach the guarded electrode 3. Connect the 16451B 4. Cable length compensation 5. Compensation for adjustment of electrodes 6. Adjust the electrodes 7. Set the measurement conditions 8. Compensate the residual impedance 9. Insert the MUT 10. Cp-D measurement 11. Calculate permittivity END Electrode Recommended capacitance* A 50 pf ± 0.5 pf B 5 pf ± 0.05 pf C, D 1.5 pf ± 0.05 pf * Measured Cp value at 100 khz

12 12 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Special considerations As mentioned before, to reduce the effect of the airgap, which occurs between the MUT and the electrodes, it is practical to employ the contacting electrode method with thin film electrodes (Refer to Section 2.2). Electrodes C and D are provided with the 16451B to carry out this method. Materials under test that transform under applied pressure cannot keep a fixed thickness. This type of MUT is not suitable for the contacting electrode method. Instead, the non-contacting method should be employed. When the non-contacting method is employed, the electrode gap tg is required to be at most 10% larger than the thickness of the MUT. It is extremely difficult to create a 10% electrode gap with thin film materials. Therefore, it is recommended that only materials thicker than a few millimeters be used with this method. The micrometer on the 16451B is designed to make a precise gap when using the non-contacting electrode method. Accurate measurements of the thickness of MUT cannot be made, when employing the contacting electrode method. This is because the micrometer scale is very dependent upon the guard and the unguarded electrodes being parallel. Using a separate micrometer for measuring thickness is recommended.

13 13 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 2.5. Measurement system using the 16453A dielectric material test fixture Main advantages Wide frequency range from 1 MHz 1 GHz Option E4991B-002 (material measurement software) internal firmware in the E4991B solves edge capacitance effect Open, short and load compensation Direct readouts of complex permittivity are possible with the Option E4991B-002 (material measurement software) internal firmware in the E4991B. Temperature characteristics measurements are possible from 55 C to +150 C (with Options E4991B-002 and E4991B-007). Applicable measurement instruments: E4991B (Option E4991B-002)* Applicable MUT The applicable dielectric material is a solid sheet that is smooth and has equal thickness from one end to the other. The applicable MUT size is shown in Figure 15. d t *For temperature-response evaluation, Option E4991B-007 temperature characteristic test kit is required. A Microsoft Excel VBA sample program is pre-installed in the E4991B that provides chamber control and measurement setup functions. The sample program can be copied to an external PC Structure The structure of the 16453A can be viewed in Figure 16. The upper electrode has an internal spring, which allows the MUT to be fastened between the electrodes. Applied pressure can be adjusted as well. The 16453A is not equipped with a guard electrode like the 16451B. This is because a guard electrode at high frequency only causes greater residual impedance and poor frequency characteristics. To lessen the effect of edge capacitance, a correction function based on simulation results is used in the E4991B, Option E4991B-002 (material measurement) firmware. Figure 15. Applicable MUT size 16453A Figure 16. Structure of the 16453A d 15 mm 0.3 mm t 3 mm Upper electrode spring Diameter is 10 mm MUT Diameter is 7 mm Lower electrode t Also, residual impedance, which is a major cause for measurement error, cannot be entirely removed by open and short compensation. This is why PTFE is provided as a load compensation device.

14 14 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Principal specifications Table 8. Principal specifications of the 16453A Frequency 1 MHz to 1 GHz Max. voltage ±42 V Operating temperature -55 C to +150 C * Terminal configuration 7 mm Compensation Open, short and load * Must be accompanied by the E4991B with Options E4991B-002 and E4991B-007. The principal specifications are shown in Table 8. Figures 17 and 18 show the measurement accuracy when the E4991B is used. Further details about the measurement accuracy can be obtained from the operation manual supplied with the instrument. Figure 17. Permittivity measurement accuracy (supplemental data) Operation method Figure 19 displays the flowchart when using the 16453A and E4991B for permittivity measurements. The steps in the flowchart are described here. For further details, please refer to the Quick Start Guide for the E4991B. START 1. Select the measurement mode Figure 18. Loss tangent measurement accuracy (supplemental data) 2. Input thickness of MUT 3. Set the measurement conditions 4. Connect the 16453A 5. Input thickness of load device 6. Calibrate the measurement plane 7. Insert the MUT 8. Measure the MUT END Figure 19. Measurement procedure flowchart for the 16453A Step 1. Select the measurement mode: Select permittivity measurement in E4991B s utility menu. Step 2. Input the thickness of MUT: Enter the thickness of the MUT into the E4991B. Use a micrometer to measure the thickness. Step 3. Set the measurement conditions of the E4991B: Measurement conditions such as frequency, test voltage level, and measurement parameter are set on the measurement instrument. Step 4. Connect the 16453A: Connect the 16453A to the 7 mm terminal of the E4991B. Step 5. Input the thickness of load device: Before compensation, enter the furnished load device s (PTFE board) thickness into the E4991B Step 6. Calibrate the measurement plane: Perform open, short, and load calibration. Step 7. Insert MUT: Insert the MUT between the electrodes. Step 8. Measure the MUT: The measurement result will appear on the display. The data can be analyzed using the marker functions.

15 15 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Special considerations As with the previous measurement system, an airgap, which is formed between the MUT and the electrodes, can be a primary cause of measurement error. Thin materials and high k materials are most prone to this effect. Materials with rough surfaces (Figure 20) can be similarly affected by airgap. Cut-out for the positioning of the thin film electrode. Electrode φ 7 Back t 2 t 1 t 2 > t 1 Dielectric material Electrode φ 10 Electrode MUT Airgap Front φ Unit: mm Electrode Figure 21. Fabricated thin film electrode s size Figure 20. Rough-surfaced dielectric material There is a technique to apply a thin film electrode onto the surfaces of the dielectric material in order to eliminate the airgap that occurs between the MUT and the electrodes. This technique is shown in Figure 21 and 22. An electrode the exact shape and size to fit the 16453A is fabricated onto the dielectric material using either high-conductivity silver pastes or fired-on silver. The MUT should be shaped as in Figure 21, with the thin film electrode thinner than the dielectric material. In this case, it is vital to appropriately position the fabricated thin film electrode onto the MUT, to precisely contact the electrodes of the 16453A (Figure 22). Following this process will ensure a more accurate and reliable measurement. In addition, if the MUTs are very thin, for example close to 100 µm, it is possible to stack 3 or 4 other MUTs and then make the measurement. This will reduce the airgap and increase measurement precision. The MUT must be smooth and not transform under applied pressure. Figure 22. Positioning of the fabricated thin film on the MUT Another point to consider is the adjusting mechanism of the upper electrode s spring pressure. The spring s pressure should be as strong as possible in order to minimize the occurrence of the airgap between the MUT and the electrodes. However, MUTs which transform under extreme pressure, cannot be measured correctly, since the thickness is affected. To achieve stable measurements, the spring pressure should be set at a level that does not transform the MUT.

16 16 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Sample measurements As shown in Figure 23, a measurement result for glass epoxy frequency characteristic can be obtained by using the E4991B with the 16453A. Figure 23. Frequency response of glass epoxy (εr = 4.5)

17 17 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 3. Permeability Evaluation 3.1. Definition of permeability Permeability describes the interaction of a material with a magnetic field. It is the ratio of induction, B, to the applied magnetizing field, H. Complex relative permeability (µr*) consists of the real part (µr ) that represents the energy storage term and the imaginary part (µr ) that represents the power dissipation term. It is also the complex permeability (µ*) relative to the permeability of free space (µ 0 ) as shown in Figure 24. The inefficiency of magnetic material is expressed using the loss tangent, tan δ. The tan δ is the ratio of (µr ) to (µr ). The term complex relative permeability is simply called permeability in technical literature. In this application note, the term permeability will be used to refer to complex relative permeability Inductance measurement method Relative permeability of magnetic material derived from the selfinductance of a cored inductor that has a closed loop (such as the toroidal core) is often called effective permeability. The conventional method of measuring effective permeability is to wind some wire around the core and evaluate the inductance with respect to the ends of the wire. This type of measurement is usually performed with an impedance measuring instrument. Effective permeability is derived from the inductance measurement result using the following equations: μ ' e = μ L eff N 2 A " ( R R ) μ e = eff w μ N 2 ω A 0 0 μ* = μ* r = B B H μ* μ 0 = μ' r (real part) Figure 24. Definition of complex permeability (m*) j μ" r = (imaginary part) μ" r tan δ = μ* r = μ 0 = R eff : Equivalent resistance of magnetic core loss including wire resistance L eff : Inductance of toroidal coil R w : Resistance of wire only L w : Inductance of air-core coil inductance N: Turns : Average magnetic path length of toroidal core [m] A: Cross-sectional area of toroidal core [m 2 ] ω: 2π f (frequency) µ 0 : 4π x 10-7 [H/m] Figure 25. Method of measuring effective permeability H - Equivalent circuit L w L eff R w R eff μ r " μ r ' μ' μ 0 δ (imaginary) (real) - j μ* r Complex relative permeability Permeability of free space μ' r μ" μ 0 4π X 10-7 [H/m] Depending on the applied magnetic field and where the measurement is located on the hysteresis curve, permeability can be classified in degree categories such as initial or maximum. Initial permeability is the most commonly used parameter among manufacturers because most industrial applications involving magnetic material use low power levels. * This application note focuses on effective permeability and initial permeability, derived from the inductance measurement method. * Some manufacturers use initial permeability even for magnetic materials that are employed at high power levels.

18 18 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note 3.3. Permeability measurement system The next section demonstrates a permeability measurement system using the 16454A magnetic material test fixture Measurement system using the 16454A magnetic material test fixture Main advantages Wide frequency range from 1 khz to 1 GHz Simple measurements without needing a wire wound around the toroid Two fixture assemblies are provided for different MUT sizes Direct readouts of complex permeability are possible with the E4991B (Option E4991B-002 material measurement software) or with the E4990A. * For temperature-response evaluation, Option E4991B-007 temperature characteristic test kit is required. A Microsoft Excel VBA sample program is pre-installed in the E4991B that provides chamber control and measurement setup functions. The sample program can be copied to an external PC. The E4990A does not have a high temperature test head. Applicable instruments: E4991B (Option E4991B-002)*, E4990A, and 42942A Temperature characteristic measurements are possible from 55 C to +150 C (with the E4991B Options E4991B-002 and be4991b-007) Applicable MUT The applicable magnetic material can only be a toroidal core. The applicable MUT size is shown in Figure Structure The structure of the 16454A and the measurement concept are shown in Figure 27. When a toroidal core is inserted into the 16454A, an ideal, c b E4991B/E4990A 8 mm 3.1 mm Small size 3 mm Figure 26. Applicable MUT size (Zm Zsm) 2π c + 1 jωµ0 hln b 20 mm 5 mm Large size µ Relative permeability Z m Measured impedance with toroidal core Zsm Measured impedance without toroidal core µ 0 h c b µ = Permeability of free space Height of MUT (material under test) Outer diameter of MUT Inner diameter of MUT 8.5 mm single-turn inductor, with no flux leakage, is formed. Permeability is derived from the inductance of the toroidal core with the fixture. Figure 27. Structure of the 16454A and measurement concept

19 19 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Principal specifications % h In C b = 10 [mm] Table 9. Principal specifications of the 16454A Frequency 1 khz to 1 GHz Max dc bias current ±500 ma Operating temperature -55 C to +150 C Terminal configuration 7 mm Compensation Short μr' % 10% Principal specifications of the 16454A are shown in Table 9 above. Figures 28 and 29 show the measurement accuracy when either the E4991B or the E4990A are used Operation method Figure 30 displays the flowchart when using the 16454A for permeability measurements. Each step of the flowchart is described here: Step 1. Calibrate the measurement instrument: When using the E4991B, calibrate at the 7 mm terminal. When using the E4990A, perform SETUP on the 7 mm terminal of the 42942A. Step 2. Connect the 16454A: Connect the 16454A to the measurement instrument s 7 mm terminal. When using the E4991B, select the permeability measurement mode. Step 3. Compensate the residual impedance of the 16454A: Insert only the MUT holder and perform short compensation. Step 4. Input size of MUT: Enter the size of the MUT into the measurement instrument s menu. Use a micrometer to measure the size. Step 5. Insert MUT: Insert the MUT with the holder into the 16454A. Step 6. Set the measurement conditions: Measurement conditions such as frequency, test signal level, and measurement parameter are set on the measurement instrument. tan δ error (Ea) E E E E+00 20% 0 1k 10k 100k 1M 10M 10M 1G Frequency [Hz] Figure 28. Permeability measurement accuracy (supplemental data) μ'r =300 μ'r =1000 μ'r =3000 μ'r =100 μ'r =3 μ'r =10 μ'r =30 20% h In C b = 10 [mm].00 E+00 1k 10k 100k 1M 10M 100M 1G Frequency [Hz] Figure 29. Loss tangent measurement accuracy (supplemental data) Step 7. Measure the MUT: The measurement result will appear on the display. The data can be analyzed using the marker functions. Internal firmware comes standard with the material measurement function when using the E4991B (Option E4991B-002). For more details, refer to the Operation Manual of the E4991B. START 1. Calibrate the instrument 2. Connect the 16454A 3. Compensate the residual impedance 4. Input the size of the MUT 5. Insert the MUT 6. Set the measurement conditions 7. Measure the MUT END Figure 30. Measurement procedure flowchart for the 16454A

20 20 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Special considerations When measuring a magnetic material with a high permittivity (near 10 or above), precise measurements cannot be performed near 1 GHz. Permeability is derived from the inductance value of the combined impedance of the MUT and the fixture. The measured impedance should be composed of inductance and a negligible amount of capacitance. When the magnetic material s permittivity is high, current flows through the space between the MUT and the fixture. This is equivalent to a capacitor connected in parallel to the inductor (of the MUT). This parallel LC circuit causes an impedance-resonance at a destined frequency. The higher the permittivity, the lower the resonant frequency will be and precise measurements will be difficult Sample measurements Figure 31. Frequency response of ferrite core (μr = 120) Frequency characteristic measurement results of a ferrite core are shown in Figure 31. The E4991B and the 16454A were used to obtain the results in Figure Conclusion In this application note, permittivity and permeability measurement methods using impedance measurement technology were discussed. The discussions covered various test fixtures structures, applicable MUT sizes, operation methods and special considerations. By using this application note as a reference, a measurement solution that satisfies measurement needs and conditions can be selected easily.

21 21 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Appendix A. Permittivity Evaluation of Liquids Permittivity measurements are often used for evaluation of liquid characteristics. Permittivity measurements do not change the liquid physically and can be conducted rather simply and quickly. As a result, they are utilized in a wide array of research areas. Here, the 16452A liquid test fixture, which employs the parallel plate method, will be discussed as a permittivity measurement system for liquids. A.1. Measurement system using the 16452A liquid test fixture A.1.1. Main advantages Wide frequency range from 20 Hz to 30 MHz Plastic resins, oil-based chemical products and more can be measured Measurement is possible with a small volume of test liquid so MUT is not wasted Temperature characteristic measurements are possible from 20 C to +125 C Can be used with any impedance measuring instrument that has a 4-terminal configuration. A.1.2. Applicable MUT Applicable instruments: E4990A and E4980A Table 10. Relationship between spacers and liquid capacity Sample liquid capacity 3.4 ml 3.8 ml 4.8 ml 6.8 ml Air capacitance (no liquid present) 34.9 pf 21.2 pf 10.9 pf 5.5 pf ±25% ±15% ±10% ±10% Spacer thickness 1.3 mm 1.5 mm 2 mm 3 mm A.1.3. Structure The structure of the 16452A is shown in Figure 32. Three liquid inlets simplify pouring and draining and the fixture can be easily disassembled so that the electrodes can be washed. Nickel is used for the electrodes, spacers, liquid inlet and outlet and fluoro-rubber is used for the O-rings. Lo Ceramic 37 mm 85 mm Ceramic Hi Spacer S SMA SMA 85 mm The sample liquid capacity is dependent upon which spacer is used. The spacer adjusts the gap between the electrodes and causes the air capacitance to be altered as well. Table 10 lists the available spacers and the corresponding sample liquid capacities. Figure 32. Structure of the 16452A Table m cables for the 16452A Temperature Part number 0 C to 55 C 16048A -20 C to 125 C C to 125 C 16048G (E4990A only)

22 22 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note A.1.4. Principal specifications Table 12. Principal specifications of the 16452A Frequency 20 Hz to 30 MHz Max voltage ± 42 V Operating temperatures -20 C to 125 C Terminal configuration 4-terminal pair, SMA Compensation Short The principal specifications of the 16452A are shown in Table 12 and the measurement error is calculated using the following equation. Measurement accuracy = A + B + C [%] Error A: see Table 13 Error B: when ε r = 1; see Figure 33 Error C: error of measurement instrument Table 13. Error A Spacer thickness (mm) B (%) x MRP x MRP x MRP x MRP Error B 10.0% 1.0% 0.15% 0.2% 1.0% 2.0% 5.0% 25% 15% 10% 0.1% 500k 2M 5M 15M 20M k 10k 100k 1M 10M 30M Frequency [Hz] Figure 33. Relative measurement accuracy (supplemental data) M.R.P is measurement relative permittivity

23 23 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note A.1.5. Operation method Figure 34 displays the flowchart when using the 16452A for permittivity measurements of liquids. Each step of the flowchart is described here: Step 1. Assemble the 16452A and insert the shorting plate: While attaching the high and low electrodes, insert the shorting plate between them. Next, prepare the 16452A for measurement by connecting the SMA-BNC adapters to the terminals of the fixture and putting the lid on the liquid outlet. Step 2. Connect the 16452A to the measurement instrument: Select the appropriate 1 m cable depending on the operating temperature and the measurement instrument. Connect the 16452A to the UNKNOWN terminals of the measurement instrument. Step 3. Compensate the cable length: Set the measurement instrument s cable length compensation function to 1 m. Refer to the measurement instrument s operation manual for the setting procedure. Step 4. Check the short residual of the 16452A: To verify whether the 16452A was assembled properly, measure the shorting plate at 1 MHz and check if the value falls within the prescribed range. Perform this verification before short compensation. For further details, refer to the Operation Manual provided with the 16452A. Step 5. Set the measurement conditions: Measurement conditions such as frequency and test voltage level are set on the measurement instrument. The measurement parameter should be set to Cp-Rp. Refer to the measurement instrument s operation manual for the setting procedure. Step 6. Perform short compensation: Perform short compensation with the shorting plate inserted between the electrodes. Step 7. Measure the air capacitance: Remove the shorting plate, and insert the appropriate spacer required for the sample liquid volume. The air capacitance that exists between the electrodes is measured with the parameter Cp-Rp. Step 8. Pour liquid in: Pour the liquid into the inlet of the fixture. Step 9. Measure liquid: Perform a Cp-Rp measurement with the liquid in the fixture. Step 10. Calculate permittivity: Permittivity and loss factor is calculated using the following equations: ' C ε r = C p 0 ε r " = 1 ω C R p 0 Cp: Equivalent parallel capacitance of MUT [F] C0: Equivalent parallel capacitance of air [F] Rp: Equivalent parallel resistance of MUT [Ω] ω: 2 π f (frequency) Step 11. Drain liquid out: Drain the liquid out from the outlet of the fixture. A.1.6. Special considerations There is a high possibility that liquids with bulk conductivity such as salt (Na+ Cl-) or ionic solutions cannot be measured. This is due to the electrode polarization phenomenon, which causes incorrect capacitance measurements to occur for these types of liquids. Even for low frequency measurements of liquids that do not have bulk conductivity, such as water, there is a high possibility that electrode polarization will occur. START 1. Assemble the 16452A and insert the shorting plate 2. Connect the 16452A 3. Cable length compensation 4. Check the short residual 5. Set the measurement conditions 6. Perform short compensation 7. Measure the air capacitance 8. Pour the liquid in 9. Measure the liquid 10. Calculate permittivity 11. Drain the liquid END Figure 34. Measurement procedure flowchart for the 16452A

24 24 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note References 1. ASTM, Test methods for A-C loss characteristics and permittivity (dielectric constant) of solid electrical insulating materials, ASTM Standard D 150, American Society for Testing and Materials 2. ASTM, Test methods for D-C resistance or conductance of insulating materials, ASTM Standard D 257, American Society for Testing and Materials 3. Application Note 1297, Solutions for measuring permittivity and permeability, Keysight literature number E 4. Application Note 380-1, Dielectric constant measurement of solid materials using the 16451B dielectric test fixture, Keysight literature number Accessories Selection Guide for Impedance Measurements, Keysight literature number E 6. Keysight 16451B Operation and Service Manual, PN Keysight 16452A Operation and Service Manual, PN Keysight 16454A Operation and Service Manual, PN Web resources Please visit our website at: for more information about impedance test solutions, for more information about lcr meters. For more information about material analysis visit:

25 25 Keysight Solutions for Measuring Permittivity and Permeability with LCR Meters and Impedance Analyzers - Application Note Evolving Our unique combination of hardware, software, support, and people can help you reach your next breakthrough. We are unlocking the future of technology. For more information on Keysight Technologies products, applications or services, please contact your local Keysight office. The complete list is available at: Americas Canada (877) Brazil Mexico United States (800) From Hewlett-Packard to Agilent to Keysight mykeysight A personalized view into the information most relevant to you. Asia Pacific Australia China Hong Kong India Japan 0120 (421) 345 Korea Malaysia Singapore Taiwan Other AP Countries (65) KEYSIGHT SERVICES Keysight Infoline Keysight s insight to best in class information management. Free access to your Keysight equipment company reports and e-library. Keysight Services Our deep offering in design, test, and measurement services deploys an industry-leading array of people, processes, and tools. The result? We help you implement new technologies and engineer improved processes that lower costs. Three-Year Warranty Keysight s committed to superior product quality and lower total cost of ownership. Keysight is the only test and measurement company with three-year warranty standard on all instruments, worldwide. And, we provide a one-year warranty on many accessories, calibration devices, systems and custom products. Keysight Assurance Plans Up to ten years of protection and no budgetary surprises to ensure your instruments are operating to specification, so you can rely on accurate measurements. Keysight Channel Partners Get the best of both worlds: Keysight s measurement expertise and product breadth, combined with channel partner convenience. This application note was formerly known as app note Europe & Middle East Austria Belgium Finland France Germany Ireland Israel Italy Luxembourg Netherlands Russia Spain Sweden Switzerland Opt. 1 (DE) Opt. 2 (FR) Opt. 3 (IT) United Kingdom For other unlisted countries: (BP ) DEKRA Certified ISO9001 Quality Management System Keysight Technologies, Inc. DEKRA Certified ISO 9001:2015 Quality Management System This information is subject to change without notice. Keysight Technologies, Published in USA, June 12, EN

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